Data Binding Time

[Timothy W. Cook]

This is probably a basic JS question but since I am using Polymer ... 

I do have a development background but I am not a JS guru or even intermediate. So ... 

I am getting this warning in Chrome Dev tools " Attributes on [element name] were data bound prior to Polymer upgrading the element. This may result in incorrect binding types."

​On all of my polymer elements that were created with yo polymer:el  ​[element name]

​Some of these, using core-list I have bound to static data for testing but some of them ​are still just the skeleton as created with Yeoman.

I do notice that one of my core-list elements that has 12 items will display 4 items when first selected (via a menu) and then after selecting another menu option and going back to it it displays all 12.  

I tried putting the 12 item list inside a ready function (from examples on YouTube and the Polymer site) but that didn't change the behavior. 

So what does the warnings mean and what should I do about it?  

​Thanks,

Tim

​

 

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Timothy Cook
LinkedIn Profile:http://www.linkedin.com/in/timothywaynecook

MLHIM http://www.mlhim.org

[Timothy W. Cook]

BTW: I did find this:

http://stackoverflow.com/questions/23870541/how-to-resolve-attributes-on-element-name-were-data-bound-prior-to-polymer-upgr 

But so far I haven't discovered any sequence of importing that fixes the problem.

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[Rob Dodson]

The warning is sort of opaque, but it's meant to prevent you from attempting to data bind or interact with a custom element before it has been upgraded.

It's hard to say exactly what's going wrong without seeing a simplified example. You could try creating a project with just one element that illustrates the problem and upload it to github so we can take a look

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[Timothy W. Cook]

Thanks Rob. I cannot reproduce the problem with a one element project.  

The code that does produce it is at  https://github.com/twcook/tdv_dashboard 

--Tim

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